Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f530dd703ea614c…

MALICIOUS

PDF

71.7 KB Created: 2021-03-02 23:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4a78fc17308ba65d2b57ef56b1958d6c SHA-1: d96db87b359a3d6301774890546cbff5c0d21ded SHA-256: 1f530dd703ea614c6cb9ea2fecfa24a6b4428104862c09784e736908c73c7f37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=the+choice+russell+roberts+audiobook PDF link annotation
    • https://cdn.sqhk.co/gawagunikuw/jgeukhe/15784260785.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/bzgiehb/ganam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5ff9e63f8d368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_601ccadc1d55a.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/ff70882bfbe.pdfIn PDF document text
    • https://kibimibenafozo.weebly.com/uploads/1/3/5/9/135979164/xenifozam_zisivo_wokososuz.pdfIn PDF document text
    • http://andyhongdigital.com/wurifawubagulazujanawjevso.pdfIn PDF document text
    • http://weraka.online/american_music_awards_2018_performersoptl4.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/4818963.pdfIn PDF document text
    • http://geleostone.online/comment_reparer_une_batterie_de_velo_electriquerpv5a.pdfIn PDF document text
    • http://sexesex.site/zelanuxadavegumedozu3okq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darewuxopasog.rf.gd/adhd_symptom_checklist_4.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/why_is_it_called_a_telephone_pole.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/cabal_forbidden_island_quest_guide.pdfIn PDF document text
    • http://sifepati.epizy.com/plutarch_moralia_text.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/chronic_urticaria_guidelines.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 5180 bytes
SHA-256: f7fbb981bfaa06450a8b17bbf4de384d09f8d5887fa97707cf65b492d99f98b1
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10292 bytes
SHA-256: 976a1c6141f5c990bb5c3008b9507aa7252b4efb64d323394ac30e70d1c315f3

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